<?php
namespace ApplicationController;

use ZendMvcControllerAbstractActionController;
use ZendViewModelViewModel;
use ZendViewModelJsonModel;

class DocumentsController extends AbstractActionController {

    public function indexAction() {

    }

    public function getTreeDataAction() {
        $json = new JsonModel(array(
                    'title' => 'Some Title'
                ));
        return $json;
    }

}

( ! ) Fatal error: Uncaught exception 'ZendViewExceptionRuntimeException' with message 'ZendViewRendererPhpRenderer::render: Unable to render template "application/documents/get-tree-data"; resolver could not resolve to a file' in ../vendor/ZF2/library/Zend/View/Renderer/PhpRenderer.php on line 451

//module.config.php
return array(
    'view_manager' => array(
        'strategies' => array(
           'ViewJsonStrategy',
        ),
    ),
)